﻿<!DOCTYPE html>
<html>
<head>
  <title>Rescaling GraphObjects using the RescalingTool</title>
  <!-- Copyright 1998-2021 by Northwoods Software Corporation. -->
  <meta name="description" content="A demonstration of the RescalingTool extension." />
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <script src="../release/go.js"></script>
  <script src="../assets/js/goSamples.js"></script>  <!-- this is only for the GoJS Samples framework -->
  <script src="RescalingTool.js"></script>
  <script id="code">
    function init() {
      if (window.goSamples) goSamples();  // init for these samples -- you don't need to call this
      var $ = go.GraphObject.make;  // for conciseness in defining templates

      myDiagram = $(go.Diagram, "myDiagramDiv",  // create a Diagram for the DIV HTML element
                    {
                      layout: $(go.TreeLayout),
                      "undoManager.isEnabled": true  // enable undo & redo
                    });

      // install the RescalingTool as a mouse-down tool
      myDiagram.toolManager.mouseDownTools.add(new RescalingTool());

      myDiagram.nodeTemplate =
        $(go.Node, "Auto",
          { locationSpot: go.Spot.Center },
          new go.Binding("scale").makeTwoWay(),
          $(go.Shape, "RoundedRectangle", { strokeWidth: 0 },
            new go.Binding("fill", "color")),
          $(go.TextBlock,
            { margin: 8 },
            new go.Binding("text"))
        );

      // but use the default Link template, by not setting Diagram.linkTemplate

      // create the model data that will be represented by Nodes and Links
      myDiagram.model = new go.GraphLinksModel(
      [
        { key: 1, text: "Alpha", color: "lightblue" },
        { key: 2, text: "Beta", color: "orange" },
        { key: 3, text: "Gamma", color: "lightgreen" },
        { key: 4, text: "Delta", color: "pink" }
      ],
      [
        { from: 1, to: 2 },
        { from: 1, to: 3 },
        { from: 3, to: 4 }
      ]);
    }
  </script>
</head>
<body onload="init()">
<div id="sample">
  <div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:400px"></div>
  <p>
    Selecting a node will show a rescaling handle that when dragged will modify the node's <a>GraphObject.scale</a> property.
  </p>
  <p>
    Just as the <a>ResizingTool</a> changes the <a>GraphObject.desiredSize</a> of an object,
    and just as the <a>RotatingTool</a> changes the <a>GraphObject.angle</a> of an object,
    the <a>RescalingTool</a> changes the <a>GraphObject.scale</a> of an object.
  </p>
</div>
</body>
</html>